pre-push.sh

#!/bin/sh

# Called by "git push" after it has checked the remote status,
# but before anything has been pushed.
#
# If this script exits with a non-zero status nothing will be pushed.
#
# Steps to install, from the root directory of your repo...
# 1. Copy the file into your repo at `.git/hooks/pre-push`
# 2. Set executable permissions, run `chmod +x .git/hooks/pre-push`
# 3. Or, use `rake hooks:pre_push` to install
#
# Try a force push to master, you should get a message `*** [Policy] never force push...`
#
# The commands below will not be allowed...
# 'git push --force origin master'
# 'git push --delete origin master'
# 'git push origin :master'
#
# Nor will a force push while on the master branch be allowed...
# 'git co master'
# 'git push --force origin'
#
# This will also prompt the user if he/she is attempting the push directly into
# the protected branch, preventing any accidental push.
#
# Requires git 1.8.2 or newer
#
# Git 1.8.2 release notes cover the new pre-push hook:
# <https://github.com/git/git/blob/master/Documentation/RelNotes/1.8.2.txt>
#
# See Sample pre-push script:
# <https://github.com/git/git/blob/87c86dd14abe8db7d00b0df5661ef8cf147a72a3/templates/hooks--pre-push.sample>


protected_branch='master'

policy='[Policy] Never force push or delete the '$protected_branch' branch! (Prevented with pre-push hook.)'

current_branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')

push_command=$(ps -ocommand= -p $PPID)

is_destructive='--force|delete|\-f'

will_remove_protected_branch=' :'$protected_branch

do_exit(){
  echo $policy
  exit 1
}

if [[ $push_command =~ $is_destructive ]] && [ $current_branch = $protected_branch ]; then
  do_exit
fi

if [[ $push_command =~ $is_destructive ]] && [[ $push_command =~ $protected_branch ]]; then
  do_exit
fi

if [[ $push_command =~ $will_remove_protected_branch ]]; then
  do_exit
fi

unset do_exit

if [ $current_branch = $protected_branch ]; then
  exec < /dev/tty
  read -p 'You are attempting to push directly to the '$protected_branch' branch! are you sure you want to do this (y/n)?'
  if [[ ! $REPLY =~ ^[Yy]$ ]]
  then
      echo 'Nothing pushed to '$protected_branch''
      exit 1
  fi
fi

exit 0